Digital authentication with digital and analog documents

Abstract

The disclosure describes systems for creating and authenticating printed objects using authentication information. Techniques for incorporating authentication information into digital representations of objects and using the authentication information to authenticate the objects are also provided.

Description

RELATED APPLICATION DATA[0001] The present application is a continuation in part of U.S. patent application Ser. No. 10 / 164,899, filed Jun. 4, 2002 (published as U.S. 2003-0002710 A1). The 10 / 164,899 application is a continuation of U.S. patent application Ser. No. 09 / 198,022, filed Nov. 23, 1998 (now U.S. Pat. No. 6,546,112), which is a continuation of U.S. patent application Ser. No. 08 / 763,847 (now U.S. Pat. No. 5,841,886), filed Dec. 4, 1996, which is a continuation of U.S. patent application Ser. No. 08 / 512,993, filed Aug. 9, 1995 (now abandoned). Each of these patent documents is herein incorporated by reference.[0002] This patent application is also a continuation in part of U.S. patent application Ser. No. 09 / 775,934, filed Feb. 2, 2001 (published as US 2002-0012445 A1). The 09 / 775,934 patent application is a continuation in part of U.S. patent application Ser. No. 09 / 625,577, filed on Jul. 25, 2000. Each of these patent documents is herein incorporated by reference.[0003] T...

AI Technical Summary

Benefits of technology

0098] As shown in FIG. 3, both the embedding and decoding systems may take advantage of a database for a variety of functions. This database may be local or remote as shown in FIG. 3. The embedding and decoding systems shown in FIG. 3 include a communication application (40, 54, respectively). This application enables the systems to communicate with the database system via a network. For the typical implementation adapted for computer networks like the Internet, this communication application represents network com

Problems solved by technology

Since the watermark carrying the embedded data is made to survive distortion due to normal scanning operations required to read the watermark from an object, a fragile watermark may not accurately discern copying by a counterfeiter from these normal transformations.

While the decoding process can use the orientation signal to align each block, it may not be able to discern the precise alignment of blocks in the scanned image relative to blocks in the original watermarked image.

As such, the decoder may only be able to recover the relative location of blocks to each other, but not their absolute location in th

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